/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * Neither the name of the HISP project nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.expression;

public enum Operator
{
    equal_to( "==" ),
    not_equal_to( "!=" ),
    greater_than( ">" ),
    greater_than_or_equal_to( ">=" ),
    less_than( "<" ),
    less_than_or_equal_to( "<=" ),
    compulsory_pair( "[Compulsory pair]" ),
    exclusive_pair( "[Exclusive pair]" );

    private final String mathematicalOperator;

    Operator( String mathematicalOperator )
    {
        this.mathematicalOperator = mathematicalOperator;
    }

    public String getMathematicalOperator()
    {
        return mathematicalOperator;
    }

    public static Operator fromValue( String value )
    {
        for ( Operator operator : Operator.values() )
        {
            if ( operator.mathematicalOperator.equalsIgnoreCase( value ) )
            {
                return operator;
            }
        }

        return null;
    }

    public static Operator safeValueOf( String name )
    {
        return name != null ? Operator.valueOf( name ) : null;
    }
}
